# 11. Get Funding Fee Rate of an Option Transaction

## Description

Get funding fee rate of an option transaction .

**TBD: Narratives**

## Function Description

|          Item          |                                               Description                                              |
| :--------------------: | :----------------------------------------------------------------------------------------------------: |
|  **Contract Address**  |                Underlying asset contract (referenced by Smart Contract Overview section)               |
|    **Contract Name**   |                                           UnderlyingAsset.sol                                          |
|      **Function**      | function getFundingFeeRate(ContractType \_contractType) public view returns (uint256 \_fundingFeeRate) |
|  **Function Selector** |                                               0xc138aa5f                                               |
|   **Invocation Type**  |                                              Ethereum Call                                             |
| **Passing Parameters** |                                             1: CALL, 2: PUT                                            |
|    **Return Value**    |                                   Funding fee rate(multiplied by 1E8)                                  |

## ABI Description

```
{
  "inputs": [
    {
      "internalType": "enum ISLDCommon.ContractType",
      "name": "_contractType",
      "type": "uint8"
    }
  ],
  "name": "getFundingFeeRate",
  "outputs": [
    {
      "internalType": "uint256",
      "name": "_fundingFeeRate",
      "type": "uint256"
    }
  ],
  "stateMutability": "view",
  "type": "function"
}
```

## Examples

### Calling Examples

{% tabs %}
{% tab title="JavaScript" %}

```javascript
// This example is written by using Web3.js
// More details on Web3.js could be found here - https://web3js.readthedocs.io/

var Web3 = require('web3');
const BigNumber = require('bignumber.js');

// BSC Mainnet: https://bsc-dataseed.binance.org
// BSC Testnet: https://data-seed-prebsc-1-s1.binance.org:8545
const  web3 = new Web3("https://data-seed-prebsc-1-s1.binance.org:8545");

const CONTRACT_ADDRESS = "Replace with underlying assets contract address";
const ABI = [{
  "inputs": [
    {
      "internalType": "enum ISLDCommon.ContractType",
      "name": "_contractType",
      "type": "uint8"
    }
  ],
  "name": "getFundingFeeRate",
  "outputs": [
    {
      "internalType": "uint256",
      "name": "_fundingFeeRate",
      "type": "uint256"
    }
  ],
  "stateMutability": "view",
  "type": "function"
}];

var contract = new web3.eth.Contract(ABI, CONTRACT_ADDRESS);

// CALL
contract.methods.getFundingFeeRate(1).call({
}, function(error, result){
    if(!error) {
      console.log('Response:', result);
    } else {
      console.log(error);
    }
});

// PUT
contract.methods.getFundingFeeRate(2).call({
}, function(error, result){
    if(!error) {
      console.log('Response:', result);
    } else {
      console.log(error);
    }
});
```

{% endtab %}

{% tab title="Python" %}

```
# This example is written by using Web3.py
# More details on Web3.py could be found here - https://web3py.readthedocs.io/


```

{% endtab %}
{% endtabs %}

### HTTP Request Example

## Send a call request to get private pool info

<mark style="color:green;">`POST`</mark> `(BSC Mainnet) https://bsc-dataseed.binance.org/`

\
Make a contract call to get deposited funds details in private pool of Shield Protocol V1.\
More details on how to make a contract call request via BSC RPC could be found here, <https://ethereum.org/en/developers/docs/apis/json-rpc/#eth\\_sendrawtransaction><br>

#### Request Body

| Name    | Type   | Description                                                          |
| ------- | ------ | -------------------------------------------------------------------- |
| jsonrpc | string | "2.0"                                                                |
| method  | string | "eth\_call"                                                          |
| params  | array  | the signed transaction data coerced into string array, for instance, |
| id      | number | request sequence id, you could use timestamp as id                   |

{% tabs %}
{% tab title="200 The result responded could be decoded into two uint256 numbers which represents the total amount and the available amount of deposited funds." %}

```
{
    "jsonrpc": "2.0",
    "id": 1234,
    "result": "0x00000000000000000000000000000000000000000042276639528ca5195640e500000000000000000000000000000000000000000040f62cc1eeed6f34b8e3e500000000000000000000000000000000000000000001313977639f35e49d5d00"
}
```

{% endtab %}
{% endtabs %}

**Request Body Example:**

```
// CALL
{
    "jsonrpc": "2.0",
    "method": "eth_call",
    "params": [
        {
            "from": "0x0000000000000000000000000000000000000000",
            "to": "0x60e2be64528dbe4e5892254d3dad83809a3f6f3a",
            "data": "0xc138aa5f0000000000000000000000000000000000000000000000000000000000000001"
        },
        "latest"
    ],
    "id": 1234
}

// PUT
{
    "jsonrpc": "2.0",
    "method": "eth_call",
    "params": [
        {
            "from": "0x0000000000000000000000000000000000000000",
            "to": "0x60e2be64528dbe4e5892254d3dad83809a3f6f3a",
            "data": "0xc138aa5f0000000000000000000000000000000000000000000000000000000000000002"
        },
        "latest"
    ],
    "id": 1234
}
```

**CURL Example:**

```bash
# CALL
curl --location --request POST 'https://data-seed-prebsc-1-s1.binance.org:8545' \
--header 'Content-Type: application/json' \
--data-raw '{
    "jsonrpc": "2.0",
    "method": "eth_call",
    "params": [
        {
            "from": "0x0000000000000000000000000000000000000000",
            "to": "0x60e2be64528dbe4e5892254d3dad83809a3f6f3a",
            "data": "0xc138aa5f0000000000000000000000000000000000000000000000000000000000000001"
        },
        "latest"
    ],
    "id": 1234
}'

# PUT
curl --location --request POST 'https://data-seed-prebsc-1-s1.binance.org:8545' \
--header 'Content-Type: application/json' \
--data-raw '{
    "jsonrpc": "2.0",
    "method": "eth_call",
    "params": [
        {
            "from": "0x0000000000000000000000000000000000000000",
            "to": "0x60e2be64528dbe4e5892254d3dad83809a3f6f3a",
            "data": "0xc138aa5f0000000000000000000000000000000000000000000000000000000000000002"
        },
        "latest"
    ],
    "id": 1234
}'
```